Ever since I began windsurfing Ive been using a waist harness, and really liked the ease of transitoining and such. Last year I bought a DaKine Thermoform and like it very much. Only the problem is, after a certain amount of sailing it tends to ride up, turning it into a chest harness, and causing my back to cramp up. Aside from stopping all presses, and coming to a full stop to readjust the thing, is there any way to be sure that the harness doesnt inch its way up like that?

I use the same harness.
Like it...I just put it on super snug at the begining. Tight on the big velcro, and then tighter on the two side elastic/ To the point of bad breathing, but it loosens a bit as the velcro tightens

When I replaced the Dakine Thermoform with the latest model couple seasons ago, the size S seemed a little larger than the old size S harness. The harness would creep up a little even with the primary & PowerBelt cinched to max tightness. Started wearing a neovest (2mm?). Solved the problem plus provided some impact protection. Maybe the next size down. Maybe another model or manufacture.

Besides the boom height and harness length:
Did you try to adjust the power belt velcro adjustments close to the thermoform piece? Pull them closer for a snug fit prior to latching. I make small adjustsments for transitions from full suit to spring suit to skin and back.

Ok, well I was at my ropes end (so to speak) on this one. Thanks for all the ideas, Ill be giving them a try next time. I like the lower booms idea, I think I tend to have it too high because Im used to light wind sailing. Doing that in the gorge is not the best though. Cheers!

I had the same problem after sailing years with a seat, then going to a waist. a few years ago. I hate to say it, but the reason the harness rode up on me was all me. I had a bad stance from sitting all those years.
If you still have the problem after trying some of the sugestions already made try this.
When youre sailing remember youre not in a seat anymore and really keep your shoulders back and hips in. This is propper stance and youll plane much sooner as well.

After switching my stance a bit, Ive never had that problem again with any waist harness.

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